Another possible extension is
\(f(Q)\)  gravity [1]} constructed by extending STEGR which is the particular case \(f(Q)=Q\) .
Such a theory, not requiring, a priori, the Equivalence Principle, is suitable to be dealt, as said, under the standard of gauge theories and presents other advantages. For example, it
seemingly shows not strong coupling problems because of additional scalar modes [2]} while the \(f(T)\)  gravity presents these problems when perturbations around a Friedman-Lemaître-Robertson-Walker (FLRW) metric are considered [3]}. Also, the linear perturbations of scalar, vector, and tensor modes in \(f(Q)\)  gravity have been studied [4]}.
